Self-winding electric clock.



No. 734,674. PATENTED JULY 28, 1903.

C. M. CROOK. SELF WINDING ELECTRIC CLOCK.

APPLICATION FILED 00T. 16, 1902.

NCMODEL.

UNITED STATES l Patented July 28, 1903.

PATENTN OFFICE.

CHARLES M.V CROOK, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR vTO CHARLESS.BURTON, TRUSTEE, OF. OAKPARK, ILLINOIS;

SELFVVINDING ELECTRIC CLOCK.

SPECIFICATION forming part of Letters Patent N o. 734,674,`dated J' uly28, 1903.

Application filed October 16, 1902. Serial No. 127,452. (No model.)

To all whom it may concern:

Be itknown that I, CHARLES M. OROOK, a citizen of the United States,residing at New Britain, in the' county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inElectromagnets and Armatures for Clocks, of which the following is aspecification, reference being had to the accompanying drawings, forminga part thereof.

The purpose of this invention is to provide an improved structure forelectromagnets and armatures for the same and for and in connection withelectric clocks.

It consists in details of construction of the magnet and clock-frame atthe part for attachment of the magnet thereto and ofthe armature and thelever which it moves, as fully set out in the claims.

In the drawings, Figure lis a side elevation of an electromagnet andarmature and portion of the clock-frame in which it is mounted embodyingmy improvements. Fig. 2 is an edge elevation of the magnet and adjacentportion of the frame and armature and armature-lever. Fig. 3 is a topplan of the same. Fig. 4 is a section at the line 4 4 on Fig. 2. Fig. 5is a detail plan of one of the plates of the magnet cross-head. Fig. 6is a plan of the locking-plate securing the magnet to the clock-frame.

I aim by the present invention to produce a magnet and armature andconnected parts cheaply and at the Sametime adapt them in form to causethe magnet to be supported with exact erectness and fixedness ofposition on the clock-frame by means of the crosshead, which is theelement by-which the attachment is necessarily made, and I aim also tomake the armature cheap and at the same time exact in construction andall the parts easy to be assembled in the clock-frame. The details ofconstruction are directed to the accomplishment of these purposes. Thespools l l of the magnet are of ordinary construction, having soft ironor steel cores 2 2 protruding from the heads of the spools sufficientlyfor attachment of the cross-head of the magnet to them at one end andfor the proper approach of the armature to them at the other end. Thecross-head is made of a multiplicity of thin soft iron or steel plates 33 3, which being made of sheet metal can be readily cut out with a die`and are therefore substantially exactly uniform. These plates 3 aredesigned to be interlocked with the clock-frame plates, and for` thispurpose they are formed with a portieri 3a, constituting a broad shorttongue whose lateral edges are parallel and whose extent in thedirection of length of the plate is the distance between the front andrear clock-frame plates 4 4, so that a group of these plates assembledas seen in Figs. 2 and 4 may be lodged between the bars 4a, whichproject horizontally from the front and rear plates at one lower cornerto afford means for mounting the "magnet, and thereby both constitute anexact spacing means between the plates and may also be clamped rmlybetween them by any bolts or like means used to bind the frame-platestogether front and rear. To more fully inter'- lock the plate 3with theclock-frame plates and further increase their value as a means ofsecuring the clock-plates together, I'form these cross-head plates insome instances with the narrow lugs 3b 3b at the ends beyond the laterallimits of the broad tongue 3a, with slots 3c 3c between the lateraledges of said tongue and said lugs, said slots being in widthsubstantially equal to the thickness of the front and rear clock-plates4 4, so'that the f cross-head plates being lodged, as described, betweensaid front and rear clock-frame plates receive said latter plates insaid slots, and thus check them against outward as well as againstinward movement. `g These plates are bound to the magnet-cores 2 2 andalso bound to the clock-plates by means of the bolts 5 5,which arescrewed into the ends of the cores, being inserted through the group ofplates, said group being divided into two parts, preferably with anequal number of plates on each side of the bolts, as seen clearly inFigs. 2 and 4. In order to insure the most perfect continuity ofmetallic connection between the *Y so that when the bolts are tightenedthe lugs 4 ofthe cross-head plates 3 3, the tie-plate 6, and thebinding-plate 7 are all clamped rigidly to the ends of the cores.Preferably the bars 4f are recessed at the upper and lower edges, asseen at 4b 4b, to cause the tie-plate 6 and the binding-plate 7 to belodged accurately as to lateral position, and these plates may also benotched, as seen at 6,Yto receive the edges ofthe notches 4b, thusfurther increasing the'jcertainty of exact relation between the partswhen assembled.

The armature is composed of a multiplicity of soft-iron plates 8 8,8,which are assembled in a bunch'and retained by brassl or othernon-magnetic yoke-plates 9 9. These yokeplates are preferably formed soaste constitutel also the lever-arm of the armature; but this isincidental. The yoke-plateswhave each a rectangular aperture which invertical dimension is equal to the width of the plates 8 8 and inhorizontal dimension is equal to the combined thickness ot' the groupfwhen assembled compactly. The two yoke-plates are preferably forconvenience in adapting them also to serve'fas the armature-lever madeseparately and are folded at 9a and 9F?, so as to have each a leverportion 9, said lever portions extending face to face and being, ifdesired, secured together by soldering or riveting. The distance betweenthe two bends V99v and 9b is such that when the two yoke-plates are thusassembled the distance between the apertured arms in which thearmature-plates are mounted is such that the edges of these armsshalluct strike the poles, but preferably may both pass between the latter,permitting the plates which constitute the armature proper to approachas close as may be desired to the magnet-poles, said poles projectingfrom the heads of the spool a suicient distance to accommodate the widthot the lower marginal portion of the yoke-platesbelow the rectangularaperture which holds the arm-ature-plates. This form of yoke-plate isccnvenient as affording easy means for pivoting them, as seen in Fig. l,so that they may be easily entered and driven tight into therectangularapertures of the yoke-plates,no other means for securing themthan the tight fit which may thus be produced being necessary.

I claimm n l. In an electric clock, in combination with the clock-plateshaving'bars for mounting the magnet, the magnet, comprising crossheadplates for connecting the spool-cores interlocked with bars ofthefclock-frame plates; and means for binding said plates and barsrigidly together and to the spool-cores.

2. In an electric clock,in combination with the clock-frame plateshaving bars for supporting the magnet, the'magnet comprising the spoolsand a multiplicity of plates for a cross-head provided with tonguesextending between the clock-frame-plate bars; and means for clamping theclock-frame-plate bars and cross-head plates to the ends of thespool-cores. i

3. In an electric clock, in combination'with clock-frame plates havingbars for mounting the magnet, the magnetfcompri'sing spools; amultiplicity of thin plates of uniform'pattern assembled side by iside,abutting edgewise toward the spool-cores, and interlocking edgewise withthe bars of the clock-plates; a clamping-plate extending across thelower edge of the bars, and clamping-bolts taking through such clampingplate, extending through the group of crass-head plates and taking intothe 4spool-cores.

4. In an electric clock, in combination with the clock-frame plateshaving bars for mounting the magnet; the magnet comprising thespool-cores and a cross-head connecting the' cores consisting of amultiplicity of plates assembled edgewise toward the ends of the coresand interlocked with the clock-frame bar-plates; a clamping-plateextending across the'edges of the clock-plates opposite the ends of thecores; and bolts from the ends of the cores extending through the groupof crosshead plates, having a stop on the outer side of theclamping-plate.

5V. In an electric clock,"a magnet-armature comprising a pair ofyoke-plates secured together and fulcrumed on the clock-frame, havingterminal portions spaced from each other overhanging the magnet-spools,said terminal portions having apertures in line, and a multiplicity ofarmature-plates assembled and fitting tightly in said apertures.

6. In an electric clock, a magnet-armature comprising a pair ofyoke-plates secured together and fulcrumed on the clock-frame, havingterminal portions spaced from each other, overhangiug the magnet-spools,said terminal portions having apertures inline, and a multiplicity ofarmature-plates assembled face to face edgewise toward the magnet-polesoccupying saidVV apertures.

7. In an electric clock,a magnet-armature and lever comprising twosimilar plates of non-magnetic substance, folded so as to have portionscoinciding and terminal pieces extending parallel at a distance apart; arockshaft for such lever extending through the IOC IOS

IIC

spaced or separated portions, whereby a wide at Bristol, Connecticut,this 25th day of 'Sepbearing is obtained; said parallel separatedtember, A. D. 1902.

portions having apertures in line and a mult tiplieity of soft-ironplates assembled and CHARLES M' LROOK 5 tightly fitted in saidapertures. In presence of- In testimony whereof I have hereunto setJAMES D. WHIPPLE, my hand, in the presence of two witnesses, 'l STEPHENH. MASON.

